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Unified Diff: src/regexp/arm/regexp-macro-assembler-arm.cc

Issue 2827243005: Revert of [regexp] Remove remainder of native RegExpExecStub (Closed)
Patch Set: Created 3 years, 8 months ago
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Index: src/regexp/arm/regexp-macro-assembler-arm.cc
diff --git a/src/regexp/arm/regexp-macro-assembler-arm.cc b/src/regexp/arm/regexp-macro-assembler-arm.cc
index 5caaee3bc8b68cae0107a487638c570d94b4ed51..579423ff32e4351d137a7bf17e89fcd7f68cf437 100644
--- a/src/regexp/arm/regexp-macro-assembler-arm.cc
+++ b/src/regexp/arm/regexp-macro-assembler-arm.cc
@@ -41,13 +41,14 @@
* Each call to a public method should retain this convention.
*
* The stack will have the following structure:
- * - fp[52] Isolate* isolate (address of the current isolate)
- * - fp[48] direct_call (if 1, direct call from JavaScript code,
+ * - fp[56] Isolate* isolate (address of the current isolate)
+ * - fp[52] direct_call (if 1, direct call from JavaScript code,
* if 0, call through the runtime system).
- * - fp[44] stack_area_base (high end of the memory area to use as
+ * - fp[48] stack_area_base (high end of the memory area to use as
* backtracking stack).
- * - fp[40] capture array size (may fit multiple sets of matches)
- * - fp[36] int* capture_array (int[num_saved_registers_], for output).
+ * - fp[44] capture array size (may fit multiple sets of matches)
+ * - fp[40] int* capture_array (int[num_saved_registers_], for output).
+ * - fp[36] secondary link/return address used by native call.
* --- sp when called ---
* - fp[32] return address (lr).
* - fp[28] old frame pointer (r11).
@@ -80,14 +81,17 @@
* int start_index,
* Address start,
* Address end,
+ * Address secondary_return_address, // Only used by native call.
* int* capture_output_array,
- * int num_capture_registers,
* byte* stack_area_base,
- * bool direct_call = false,
- * Isolate* isolate);
+ * bool direct_call = false)
* The call is performed by NativeRegExpMacroAssembler::Execute()
* (in regexp-macro-assembler.cc) via the CALL_GENERATED_REGEXP_CODE macro
* in arm/simulator-arm.h.
+ * When calling as a non-direct call (i.e., from C++ code), the return address
+ * area is overwritten with the LR register by the RegExp code. When doing a
+ * direct call from generated code, the return address is placed there by
+ * the calling code, as in a normal exit frame.
*/
#define __ ACCESS_MASM(masm_)
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